Loosening Front Lens Lock Ring - Polaroid 600SE Repair Manual

6. Lens collimation adjustment. If the adjustments described in Step 5 will not bring the tracking
discrepancy to within the limits listed in Step 4, adjust the position of the front lens.
a. Use a lens spanner wrench to loosen the front lens lock ring (Figure 5-23). Put a few
drops of trichloroethylene around the outside of the front lens lock ring. Let it soak into the
threads a few minutes. Break the shellac bond and free the front element.
b. Set the lens into a camera mounted on a tripod in front of the collimator, as shown in
Figure 5-1. Turn the lens bezel to the infinity stop position.
Set the collimator switch to infinity.
Cock the shutter. Trip and tape the shutter release to keep the lens open.
c. While looking through the lens adapter loupe, slowly turn the lens until the 40 lines/mm is
clear. Stop turning when you see the 40 lines/mm sharpest.
Figure 5-23. Loosening front lens lock ring
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